摘要
为了研究冲击波诱导下甲烷气体的化学和热力学非平衡过程,首先利用冲击波间断关系和理想气体状态方程,计算了甲烷的冻结冲击波参数,然后以波后的压力和温度作为初始条件,作定压反应计算,由此获得波后非平衡区的温度和化学成分随时间变化的模拟结果.计算表明,当冲击波马赫数较大时,波后冲击波温度能较快地趋于平衡,甲烷热分解的比例迅速增大,产物中C2H2,H2,C2H4等稳定产物的含量显著增加.这一结果与甲烷冲击压缩实验中观察到的结果符合较好.
To study the chemical reacting flows of shockinduced methane decomposition, firstly, frozen shock parameters were calculated using the discontinuity equations of normal shock waves. Secondly, chemical reactions at constant pressures were considered in the shock downstream. Then, the variation of temperature and chemical species with time were simulated. In the computation of nonequilibrium flows, a chemistry model involving 13 species with 40step reactions was used. The numerical results indicated that little methane was decomposed when shock Mach number was 7.5. With the increase of Mach numbers, the amount of decomposed methane and the molar fraction of some products such as H2, C2H4 and C2H2 remarkably increased in the reacting systems and the temperatures in the downstream of the shock fronts rapidly approached to the values of thermodynamic equilibrium in the systems. The computational results were in good agreement with the experimental results.
出处
《四川大学学报（自然科学版）》
CAS
CSCD
北大核心
2003年第5期891-895,共5页
Journal of Sichuan University(Natural Science Edition)
基金
中国工程物理研究院预研基金(421020102 05)
关键词
甲烷
冲击波
冻结流
非平衡
化学反应流
methane
shock waves
frozen flows
non-equilibrium
chemical reacting
